'\" t
.\"     Title: ntlm_auth
.\"    Author: [see the "AUTHOR" section]
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\"      Date: 11/25/2024
.\"    Manual: User Commands
.\"    Source: Samba 4.21.2
.\"  Language: English
.\"
.TH "NTLM_AUTH" "1" "11/25/2024" "Samba 4\&.21\&.2" "User Commands"
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.SH "NAME"
ntlm_auth \- tool to allow external access to Winbind\*(Aqs NTLM authentication function
.SH "SYNOPSIS"
.HP \w'\ 'u
ntlm_auth
.SH "DESCRIPTION"
.PP
This tool is part of the
\fBsamba\fR(7)
suite\&.
.PP
ntlm_auth
is a helper utility that authenticates users using NT/LM authentication\&. It returns 0 if the users is authenticated successfully and 1 if access was denied\&. ntlm_auth uses winbind to access the user and authentication data for a domain\&. This utility is only intended to be used by other programs (currently
Squid
and
mod_ntlm_winbind)\&.
.SH "OPERATIONAL REQUIREMENTS"
.PP
The
\fBwinbindd\fR(8)
daemon must be operational for many of these commands to function\&.
.PP
Some of these commands also require access to the directory
winbindd_privileged
in
$LOCKDIR\&. This should be done either by running this command as root or providing group access to the
winbindd_privileged
directory\&. For security reasons, this directory should not be world\-accessable\&.
.SH "OPTIONS"
.PP
\-\-helper\-protocol=PROTO
.RS 4
Operate as a stdio\-based helper\&. Valid helper protocols are:
.PP
squid\-2\&.4\-basic
.RS 4
Server\-side helper for use with Squid 2\&.4\*(Aqs basic (plaintext) authentication\&.
.RE
.PP
squid\-2\&.5\-basic
.RS 4
Server\-side helper for use with Squid 2\&.5\*(Aqs basic (plaintext) authentication\&.
.RE
.PP
squid\-2\&.5\-ntlmssp
.RS 4
Server\-side helper for use with Squid 2\&.5\*(Aqs NTLMSSP authentication\&.
.sp
Requires access to the directory
winbindd_privileged
in
$LOCKDIR\&. The protocol used is described here:
http://devel\&.squid\-cache\&.org/ntlm/squid_helper_protocol\&.html\&. This protocol has been extended to allow the NTLMSSP Negotiate packet to be included as an argument to the
YR
command\&. (Thus avoiding loss of information in the protocol exchange)\&.
.RE
.PP
ntlmssp\-client\-1
.RS 4
Client\-side helper for use with arbitrary external programs that may wish to use Samba\*(Aqs NTLMSSP authentication knowledge\&.
.sp
This helper is a client, and as such may be run by any user\&. The protocol used is effectively the reverse of the previous protocol\&. A
YR
command (without any arguments) starts the authentication exchange\&.
.RE
.PP
gss\-spnego
.RS 4
Server\-side helper that implements GSS\-SPNEGO\&. This uses a protocol that is almost the same as
squid\-2\&.5\-ntlmssp, but has some subtle differences that are undocumented outside the source at this stage\&.
.sp
Requires access to the directory
winbindd_privileged
in
$LOCKDIR\&.
.RE
.PP
gss\-spnego\-client
.RS 4
Client\-side helper that implements GSS\-SPNEGO\&. This also uses a protocol similar to the above helpers, but is currently undocumented\&.
.RE
.PP
ntlm\-server\-1
.RS 4
Server\-side helper protocol, intended for use by a RADIUS server or the \*(Aqwinbind\*(Aq plugin for pppd, for the provision of MSCHAP and MSCHAPv2 authentication\&.
.sp
This protocol consists of lines in the form:
Parameter: value
and
Parameter:: Base64\-encode value\&. The presence of a single period
\&.
indicates that one side has finished supplying data to the other\&. (Which in turn could cause the helper to authenticate the user)\&.
.sp
Currently implemented parameters from the external program to the helper are:
.PP
Username
.RS 4
The username, expected to be in Samba\*(Aqs
\m[blue]\fBunix charset\fR\m[]\&.
.PP
Examples:
.RS 4
Username: bob
.sp
Username:: Ym9i
.RE
.RE
.PP
NT\-Domain
.RS 4
The user\*(Aqs domain, expected to be in Samba\*(Aqs
\m[blue]\fBunix charset\fR\m[]\&.
.PP
Examples:
.RS 4
NT\-Domain: WORKGROUP
.sp
NT\-Domain:: V09SS0dST1VQ
.RE
.RE
.PP
Full\-Username
.RS 4
The fully qualified username, expected to be in Samba\*(Aqs
\m[blue]\fBunix charset\fR\m[]
and qualified with the
\m[blue]\fBwinbind separator\fR\m[]\&.
.PP
Examples:
.RS 4
Full\-Username: WORKGROUP\ebob
.sp
Full\-Username:: V09SS0dST1VQYm9i
.RE
.RE
.PP
LANMAN\-Challenge
.RS 4
The 8 byte
LANMAN Challenge
value, generated randomly by the server, or (in cases such as MSCHAPv2) generated in some way by both the server and the client\&.
.PP
Examples:
.RS 4
LANMAN\-Challenge: 0102030405060708
.RE
.RE
.PP
LANMAN\-Response
.RS 4
The 24 byte
LANMAN Response
value, calculated from the user\*(Aqs password and the supplied
LANMAN Challenge\&. Typically, this is provided over the network by a client wishing to authenticate\&.
.PP
Examples:
.RS 4
LANMAN\-Response: 0102030405060708090A0B0C0D0E0F101112131415161718
.RE
.RE
.PP
NT\-Response
.RS 4
The >= 24 byte
NT Response
calculated from the user\*(Aqs password and the supplied
LANMAN Challenge\&. Typically, this is provided over the network by a client wishing to authenticate\&.
.PP
Examples:
.RS 4
NT\-Response: 0102030405060708090A0B0C0D0E0F10111213141516171
.RE
.RE
.PP
Password
.RS 4
The user\*(Aqs password\&. This would be provided by a network client, if the helper is being used in a legacy situation that exposes plaintext passwords in this way\&.
.PP
Examples:
.RS 4
Password: samba2
.sp
Password:: c2FtYmEy
.RE
.RE
.PP
Request\-User\-Session\-Key
.RS 4
Upon successful authentication, return the user session key associated with the login\&.
.PP
Examples:
.RS 4
Request\-User\-Session\-Key: Yes
.RE
.RE
.PP
Request\-LanMan\-Session\-Key
.RS 4
Upon successful authentication, return the LANMAN session key associated with the login\&.
.PP
Examples:
.RS 4
Request\-LanMan\-Session\-Key: Yes
.RE
.RE
.RE
.sp
.if n \{\
.sp
.\}
.RS 4
.it 1 an-trap
.nr an-no-space-flag 1
.nr an-break-flag 1
.br
.ps +1
\fBWarning\fR
.ps -1
.br
Implementers should take care to base64 encode any data (such as usernames/passwords) that may contain malicious user data, such as a newline\&. They may also need to decode strings from the helper, which likewise may have been base64 encoded\&.
.sp .5v
.RE
.RE
.PP
\-\-username=USERNAME
.RS 4
Specify username of user to authenticate
.RE
.PP
\-\-domain=DOMAIN
.RS 4
Specify domain of user to authenticate
.RE
.PP
\-\-workstation=WORKSTATION
.RS 4
Specify the workstation the user authenticated from
.RE
.PP
\-\-challenge=STRING
.RS 4
NTLM challenge (in HEXADECIMAL)
.RE
.PP
\-\-lm\-response=RESPONSE
.RS 4
LM Response to the challenge (in HEXADECIMAL)
.RE
.PP
\-\-nt\-response=RESPONSE
.RS 4
NT or NTLMv2 Response to the challenge (in HEXADECIMAL)
.RE
.PP
\-\-password=PASSWORD
.RS 4
User\*(Aqs plaintext password
.sp
If not specified on the command line, this is prompted for when required\&.
.sp
For the NTLMSSP based server roles, this parameter specifies the expected password, allowing testing without winbindd operational\&.
.RE
.PP
\-\-request\-lm\-key
.RS 4
Retrieve LM session key
.RE
.PP
\-\-request\-nt\-key
.RS 4
Request NT key
.RE
.PP
\-\-diagnostics
.RS 4
Perform Diagnostics on the authentication chain\&. Uses the password from
\-\-password
or prompts for one\&.
.RE
.PP
\-\-require\-membership\-of={SID|Name}
.RS 4
Require that a user be a member of specified group (either name or SID) for authentication to succeed\&.
.RE
.PP
\-\-pam\-winbind\-conf=FILENAME
.RS 4
Define the path to the pam_winbind\&.conf file\&.
.RE
.PP
\-\-target\-hostname=HOSTNAME
.RS 4
Define the target hostname\&.
.RE
.PP
\-\-target\-service=SERVICE
.RS 4
Define the target service\&.
.RE
.PP
\-\-use\-cached\-creds
.RS 4
Whether to use credentials cached by winbindd\&.
.RE
.PP
\-\-allow\-mschapv2
.RS 4
Explicitly allow MSCHAPv2\&.
.RE
.PP
\-\-offline\-logon
.RS 4
Allow offline logons for plain text auth\&.
.RE
.PP
\-?|\-\-help
.RS 4
Print a summary of command line options\&.
.RE
.PP
\-\-usage
.RS 4
Display brief usage message\&.
.RE
.PP
\-d|\-\-debuglevel=DEBUGLEVEL
.RS 4
\fIlevel\fR
is an integer from 0 to 10\&. The default value if this parameter is not specified is 1 for client applications\&.
.sp
The higher this value, the more detail will be logged to the log files about the activities of the server\&. At level 0, only critical errors and serious warnings will be logged\&. Level 1 is a reasonable level for day\-to\-day running \- it generates a small amount of information about operations carried out\&.
.sp
Levels above 1 will generate considerable amounts of log data, and should only be used when investigating a problem\&. Levels above 3 are designed for use only by developers and generate HUGE amounts of log data, most of which is extremely cryptic\&.
.sp
Note that specifying this parameter here will override the
\m[blue]\fBlog level\fR\m[]
parameter in the
/etc/samba/smb\&.conf
file\&.
.RE
.PP
\-\-debug\-stdout
.RS 4
This will redirect debug output to STDOUT\&. By default all clients are logging to STDERR\&.
.RE
.PP
\-\-configfile=<configuration file>
.RS 4
The file specified contains the configuration details required by the client\&. The information in this file can be general for client and server or only provide client specific like options such as
\m[blue]\fBclient smb encrypt\fR\m[]\&. See
/etc/samba/smb\&.conf
for more information\&. The default configuration file name is determined at compile time\&.
.RE
.PP
\-\-option=<name>=<value>
.RS 4
Set the
\fBsmb.conf\fR(5)
option "<name>" to value "<value>" from the command line\&. This overrides compiled\-in defaults and options read from the configuration file\&. If a name or a value includes a space, wrap whole \-\-option=name=value into quotes\&.
.RE
.PP
\-V|\-\-version
.RS 4
Prints the program version number\&.
.RE
.SH "EXAMPLE SETUP"
.PP
To setup ntlm_auth for use by squid 2\&.5, with both basic and NTLMSSP authentication, the following should be placed in the
squid\&.conf
file\&.
.sp
.if n \{\
.RS 4
.\}
.nf
auth_param ntlm program ntlm_auth \-\-helper\-protocol=squid\-2\&.5\-ntlmssp
auth_param basic program ntlm_auth \-\-helper\-protocol=squid\-2\&.5\-basic
auth_param basic children 5
auth_param basic realm Squid proxy\-caching web server
auth_param basic credentialsttl 2 hours
.fi
.if n \{\
.RE
.\}
.if n \{\
.sp
.\}
.RS 4
.it 1 an-trap
.nr an-no-space-flag 1
.nr an-break-flag 1
.br
.ps +1
\fBNote\fR
.ps -1
.br
.PP
This example assumes that ntlm_auth has been installed into your path, and that the group permissions on
winbindd_privileged
are as described above\&.
.sp .5v
.RE
.PP
To setup ntlm_auth for use by squid 2\&.5 with group limitation in addition to the above example, the following should be added to the
squid\&.conf
file\&.
.sp
.if n \{\
.RS 4
.\}
.nf
auth_param ntlm program ntlm_auth \-\-helper\-protocol=squid\-2\&.5\-ntlmssp \-\-require\-membership\-of=\*(AqWORKGROUP\eDomain Users\*(Aq
auth_param basic program ntlm_auth \-\-helper\-protocol=squid\-2\&.5\-basic \-\-require\-membership\-of=\*(AqWORKGROUP\eDomain Users\*(Aq
.fi
.if n \{\
.RE
.\}
.SH "TROUBLESHOOTING"
.PP
If you\*(Aqre experiencing problems with authenticating Internet Explorer running under MS Windows 9X or Millennium Edition against ntlm_auth\*(Aqs NTLMSSP authentication helper (\-\-helper\-protocol=squid\-2\&.5\-ntlmssp), then please read
the Microsoft Knowledge Base article #239869 and follow instructions described there\&.
.SH "VERSION"
.PP
This man page is part of version 4\&.21\&.2 of the Samba suite\&.
.SH "AUTHOR"
.PP
The original Samba software and related utilities were created by Andrew Tridgell\&. Samba is now developed by the Samba Team as an Open Source project similar to the way the Linux kernel is developed\&.
.PP
The ntlm_auth manpage was written by Jelmer Vernooij and Andrew Bartlett\&.
